安卓无法解析价格\文本\视图/Java

1 周，4 日 Questions & Answers 287

如何删除此错误

多亏了回购协议（见下面的链接），我用AppCompatActivithttps://gist.github.com/anonymous/6dde8cc012ac94aaf9ea取代了ActionBarActivity。但错误依然存在？为什么？我需要在代码中添加什么来删除错误

// MainActivity.java
package com.example.安卓.justjava;

import 安卓.os.Bundle;
import 安卓.support.v7.app.AppCompatActivity;
import 安卓.view.View;
import 安卓.widget.TextView;

import java.text.NumberFormat;

/**
* This app displays an order form to order coffee.
*/
public class MainActivity extends AppCompatActivity {

int quantity = 2;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

/**
 * This method is called when the plus button is clicked.
 */
public void increment(View view) {
    quantity = quantity + 1;
    display(quantity);
}

/**
 * This method is called when the minus button is clicked.
 */
public void decrement(View view) {
    quantity = quantity - 1;
    display(quantity);
}

/**
 * This method is called when the order button is clicked.
 */
public void submitOrder(View view) {
    int quantity = 5;
    display(quantity);
    displayPrice(quantity * 5);
}

/**
 * This method displays the given quantity value on the screen.
 */
private void display(int number) {
    TextView quantityTextView = (TextView) findViewById(
            R.id.quantity_text_view);
    quantityTextView.setText("" + number);
}

/**
 * This method displays the given price value on the screen.
 */
private void displayPrice(int number) {
    TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
    priceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
}

}

// activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
xmlns:app="http://schemas.安卓.com/apk/res-auto"
xmlns:tools="http://schemas.安卓.com/tools"
安卓:layout_width="match_parent"
安卓:layout_height="match_parent"
tools:context="com.example.安卓.justjava.MainActivity"
安卓:orientation="vertical">

<TextView
    安卓:layout_width="wrap_content"
    安卓:layout_height="wrap_content"
    安卓:layout_margin="16dp"
    安卓:text="Aantal"
安卓:textAllCaps="true"/>

<TextView
    安卓:id="@+id/quantity_text_view"
    安卓:layout_width="wrap_content"
    安卓:layout_height="wrap_content"
    安卓:layout_margin="16dp"
    安卓:text="0"
    安卓:textSize="16sp"
    安卓:textColor="@安卓:color/black" />

<Button
    安卓:layout_height="wrap_content"
    安卓:layout_width="wrap_content"
    安卓:layout_marginTop="16dp"
    安卓:text="Bestellen"
    安卓:onClick="submitOrder" />

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安卓无法解析价格\文本\视图/Java

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